const { Plugins, Actions, log } = require('./utils/plugin');
const fs = require('fs');
const path = require('path');
const os = require('os');

const plugin = new Plugins('ai-monitor-claude');
const timers = {};
const sessionOffsets = {};

const HOME = os.homedir();
const SCAN_DIR = path.join(HOME, '.claude', 'projects');
const POLL_INTERVAL = 1000;
const IDLE_TIMEOUT_MS = 3000;

// Load logo
var logoUri = '';
try {
  var logoPath = path.join(__dirname, '..', 'static', 'img', 'claude-icon.svg');
  logoUri = 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(fs.readFileSync(logoPath, 'utf-8'));
} catch (_) {}

var STATUS = {
  idle:     { title: 'Ready',    fill: '#22c55e', blink: false, breathe: false },
  prompt:   { title: 'Prompt',   fill: '#3b82f6', blink: false, breathe: false },
  thinking: { title: 'Thinking', fill: '#f59e0b', blink: false, breathe: true },
  working:  { title: 'Working',  fill: '#f59e0b', blink: true,  breathe: false },
  typing:   { title: 'Typing',   fill: '#f59e0b', blink: false, breathe: true },
  done:     { title: 'Done',     fill: '#22c55e', blink: true,  breathe: false },
  error:    { title: 'Error',    fill: '#ef4444', blink: false, breathe: false },
};

var PRIORITY = ['error', 'working', 'typing', 'thinking', 'prompt', 'done', 'idle'];
var currentCtx = null, currentState = 'idle', lastActivityTime = 0;
var animationHandle = null;

function makeSvg(fill, label, blink, breathe) {
  var anim = '';
  if (blink) anim = '<animate attributeName="opacity" values="1;0.2;1" dur="0.8s" repeatCount="indefinite"/>';
  else if (breathe) anim = '<animate attributeName="opacity" values="1;0.4;1" dur="2s" repeatCount="indefinite"/>';
  return '<svg width="144" height="144" xmlns="http://www.w3.org/2000/svg"><rect width="144" height="144" rx="20" fill="none"/><circle cx="72" cy="58" r="32" fill="' + fill + '">' + anim + '</circle><text x="72" y="118" font-family="Arial" font-weight="bold" font-size="13" fill="white" text-anchor="middle">' + label + '</text></svg>';
}

function setDisplay(ctx, state) {
  var d = STATUS[state] || STATUS['idle'];
  plugin.setTitle(ctx, d.title);
  if (state === 'idle' && logoUri) plugin.setImage(ctx, logoUri);
  else plugin.setImage(ctx, 'data:image/svg+xml;charset=utf-8,' + makeSvg(d.fill, d.title, d.blink, d.breathe));
}

function animateTick() {
  if (!currentCtx) return;
  var d = STATUS[currentState] || STATUS['idle'];
  if (d.blink || d.breathe) {
    var now = Date.now(), period = d.blink ? 800 : 2000, phase = (now % period) / period;
    var alpha = d.blink ? (phase < 0.5 ? 1 : 0.2) : 0.4 + 0.6 * Math.sin(phase * Math.PI);
    var r = parseInt(d.fill.slice(1,3),16), g = parseInt(d.fill.slice(3,5),16), b = parseInt(d.fill.slice(5,7),16);
    var color = 'rgb(' + Math.round(16+(r-16)*alpha) + ',' + Math.round(16+(g-16)*alpha) + ',' + Math.round(16+(b-16)*alpha) + ')';
    var svg = '<svg width="144" height="144" xmlns="http://www.w3.org/2000/svg"><rect width="144" height="144" rx="20" fill="none"/><circle cx="72" cy="58" r="32" fill="' + color + '"/><text x="72" y="118" font-family="Arial" font-weight="bold" font-size="13" fill="white" text-anchor="middle">' + d.title + '</text></svg>';
    plugin.setImage(currentCtx, 'data:image/svg+xml;charset=utf-8,' + svg);
  }
}

function setState(ctx, state) {
  if (state === currentState) return;
  if (state === 'done') { setDisplay(ctx, 'done'); currentState = 'done'; setTimeout(function() { if (currentState === 'done') { currentState = 'idle'; setDisplay(ctx, 'idle'); } }, 800); }
  else { currentState = state; setDisplay(ctx, state); }
}

function normalize(obj) {
      var t = obj.type || '';
      if (t === 'user') return 'prompt';
      if (t === 'assistant') {
        var content = (obj.message || {}).content || [];
        for (var i = 0; i < content.length; i++) {
          var ct = content[i].type || '';
          if (ct === 'tool_use') return 'working';
          if (ct === 'thinking') return 'thinking';
        }
        for (var j = 0; j < content.length; j++) {
          if ((content[j].type || '') === 'text') return 'typing';
        }
        return 'typing';
      }
      if (t === 'system') { if (obj.subtype === 'turn_duration') return 'done'; return null; }
      return null;
}

function findFiles(rootDir, suffix) {
  var results = [];
  if (!fs.existsSync(rootDir)) return results;
  (function walk(dir, depth) {
    if (depth > 16) return;
    var names; try { names = fs.readdirSync(dir); } catch (_) { return; }
    for (var i = 0; i < names.length; i++) {
      var full = path.join(dir, names[i]);
      var st; try { st = fs.statSync(full); } catch (_) { continue; }
      if (st.isDirectory()) walk(full, depth + 1);
      else if (st.isFile() && names[i].endsWith(suffix)) results.push(full);
    }
  })(rootDir, 0);
  return results;
}

function tailFile(filePath, ctx) {
  var detected = false;
  try {
    var stat = fs.statSync(filePath);
    var off = sessionOffsets[filePath] || 0;
    if (stat.size < off) { sessionOffsets[filePath] = 0; return false; }
    if (stat.size === off) return false;
    var fd = fs.openSync(filePath, 'r');
    var grow = Math.min(stat.size - off, 65536);
    var buf = Buffer.alloc(grow);
    fs.readSync(fd, buf, 0, grow, off);
    fs.closeSync(fd);
    sessionOffsets[filePath] = stat.size;
    var lines = buf.toString('utf-8').split('\n').filter(function(l) { return l.trim(); });
    var bestPri = PRIORITY.length, bestState = null;
    for (var i = 0; i < lines.length; i++) {
      try { var obj = JSON.parse(lines[i]); var s = normalize(obj); if (s) { var pri = PRIORITY.indexOf(s); if (pri >= 0 && pri < bestPri) { bestPri = pri; bestState = s; } } } catch (_) {}
    }
    if (bestState) { setState(ctx, bestState); detected = true; }
  } catch (_) { delete sessionOffsets[filePath]; }
  return detected;
}

function poll(ctx) {
  var detected = false;
  var files = findFiles(SCAN_DIR, '.jsonl');
  files.sort(function(a,b) { return fs.statSync(b).mtimeMs - fs.statSync(a).mtimeMs; });
  for (var i = 0; i < Math.min(files.length, 3); i++) { if (tailFile(files[i], ctx)) detected = true; }
  if (detected) lastActivityTime = Date.now();
  if (currentState !== 'idle' && currentState !== 'done' && Date.now() - lastActivityTime > IDLE_TIMEOUT_MS) { setState(ctx, 'idle'); }
}

plugin.claude = new Actions({
  default: { pollInterval: POLL_INTERVAL },
  _willAppear: function(data) {
    var ctx = data.context;
    currentCtx = ctx; currentState = 'idle'; lastActivityTime = Date.now();
    setDisplay(ctx, 'idle');
    poll(ctx);
    timers[ctx] = setInterval(function() { poll(ctx); }, POLL_INTERVAL);
    if (!animationHandle) animationHandle = setInterval(animateTick, 200);
  },
  _willDisappear: function(data) {
    var ctx = data.context;
    if (timers[ctx]) { clearInterval(timers[ctx]); delete timers[ctx]; }
    if (currentCtx === ctx) { currentCtx = null; currentState = 'idle'; }
    if (Object.keys(timers).length === 0 && animationHandle) { clearInterval(animationHandle); animationHandle = null; }
  },
  keyUp: function(data) { poll(data.context); }
});